this is rougher than I feel after a night out and this is not finished - it needs to checks the last number sent - probably the cheapest way would be to force a number at the end that is never going to normally be there...(which I have done here in a very elegant way <img src="smileys/smiley9.gif" border="0" align="middle"> )

I expect there is a much better way - but its a start if no one else comes along...